Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5017788 | Alpha-detecting conveyor apparatus | Alfred N. Johnson | 1991-05-21 |
| 4866277 | Conveyor apparatus for detecting radioactive material in garments | Alfred N. Johnson | 1989-09-12 |
| 4862005 | Apparatus for detecting radioactive contaminants on hand tools | Alfred N. Johnson | 1989-08-29 |